Method of surfacing roads.



NITED STATEQLPATENT OFFICE.

THOM S J. BARRETT, OFBORDENTOWN, NEW JERSEY.

METHOD OF SURFACING ROADS. I

LQMLQWS.

No Drawing.

The object of my invention is to provide.

an improved method of surfacing roads whereby the work may be donequickly and economically.

A further object of my invention is to provide an improved method asstated which will require a minimum amountof machinery or specialappliances.

A further object of my invention isto provide an improved method asstated whereby the work may be accomplished without previously mixingand heating the substances of which the surface composition is formed.

' Other objects will appear hereinafter.

Incarrying out my invention, I prefer to apply the aggregate directly tothe roadway, cold and preferably without previous treatment, although ifpreferred the aggregate may be previously sprayed with a flux or hinder,although this may be omitted and I prefer to omit such treatment. Afterthe coarse aggregate is spread upon the road, preferably to the depth ofone to three inches, I apply the asphalt in a fluid state which entersthe spaces between the particles of the aggregate, the. asphalt beingpreferably added through a suitable hose. To reduce the asphalt to afluid state it may be heated or it may be combined with a suitablesolvent. If the solvent is used, only a fluid state and if preferredthemixture may be slightly warmed to reduce the amount ofsolventnecessary to be used. If a solvent is employed I prefer the sameto be an inflammable substance in which event,- after'the mixture isapplied to the aggregate I burn out the solvent. The burning out of thesolvent not only quickly removes the same so that the asphalt mayrapidly set, but it heats the asphalt and the aggregate causing the sameto firmly combine.

The use of the inflammable solvent is especially desirable when theaggregate is I composed either partially or entirely of Specification ofLetters Patent.

enough is employed to reduce the asphalt to v Patented J an. 28, 1913.

Application filed August 21, 1912. Serial No. 716,134.

crushed oyster shells as, when the solvent is burned out, the shells areslightly burned to partially reduce the same to lime, and this smallportion of lime slowly reacts under atmospheric conditions to harden andimprove the road-way with time.

After the fluid asphalt is added to the aggregate, a layer of finelydivided solid material is added and the whole is rolled.

. If the inflammable solvent is employed the finely divided material isadded after the solvent is burned out. After the asphalt is added to theaggregate, and before burning, if this latter step is resorted to, adrag or harrow may be passed over the mixture to more thoroughlyincorporate the materials, although this is not usually neces saryunless the first application of aggregate is in a thick layer.

In laying a new road-way I prefer to first spread a layer of coarseaggregate to the depth of several inches, then apply a.suflicientquantity of fluid asphalt to permeate the entire mass, the asphalt beingpreferably mixed with an inflammable solvent, burning out the solvent,if such is used, then spreading a layer 'of crushed oyster shells andstone screenings or sand, applying fluidthe last mentioned asphalt topermeate a layer of sand and layer, then spreadin rolling. Inresurfaclng old road-ways all of't-he several steps just mentioned maybe employed or some of them may be omitted as found necessaryor'desirable to sult the conditions of the road. 7

Having described my invention what I claim as new and desire tosecure byLetters Patent is i l 1. The method of surfacing roads consisting inspreading a layer of aggregate on the road-way, adding a mixture ofasphalt and an inflammable solvent, burningout the s0l vent, andspreading a layer of finely divided .solid matter.

2. A method of surfacing roads including mixing the I asphalt and aninflammable solvent, burning {out the solvent andadding hot bitumen.

3. A method of surfacing roads including mixing the aggregate containingcrushed oyster shells with a mixture of asphalt and ah inflammablesolvent and burning out the solvent.

4. The method of surfacm roads conslsting in spreading a layer 0 coarseaggreaggregate with a' mixture of gate, adding a mixture of asphalt andan name to this specification in the presence of inflammable solvent,spreading a layer of two subscribing witnesses.

finely divided aggregate including crushed oyster shells, applying moreasphalt and THOMAS BARRETT 5 solvent, burnin out the solvent and spread-Witnesses:

ing a layer of nely divided solid, matter.- C. R. ZEIGLER,

In testimony whereof I have signed-my CHAs. E. Poms.

